If you don't specify custom DNS servers in your DNS Server Virtual Network setting, Azure Spring Apps will, by default, use the Azure DNS to resolve IP addresses. If your virtual network is configured with custom DNS settings, add Azure DNS IP `168.63.129.16` as the upstream DNS server in the custom DNS server. Azure DNS can resolve IP addresses for all the public FQDNs mentioned in [Customer responsibilities running Azure Spring Apps in a virtual network](vnet-customer-responsibilities.md). It can also resolve IP address for `*.svc.private.azuremicroservices.io` in your virtual network.
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